Wet/dry automatic injector assembly
First Claim
1. An automatic injection device containing a pre-loaded charge of medicament for automatically self-administering the medicament upon actuation thereof, said automatic injection device comprising:
- a housing assembly;
a dry compartment for storing a predetermined dry charge of dry medicament therein;
a wet compartment for storing a predetermined amount of liquid injection solution therein;
a pre-loaded activation assembly for causing the liquid injection solution in said wet compartment to be transferred to said dry compartment, wherein the pre-loaded activation assembly automatically supplies a driving force upon activation to transfer the liquid injection solution in the wet compartment to the dry compartment, wherein the dry medicament dissolves in the liquid injection solution as the liquid injection solution passes through said dry compartment;
at least one dynamic spring compression assembly for maintaining the dry medicament located in said dry compartment under a continuous compressive state as the liquid injection solution passes through said dry compartment, wherein at least a portion of a compressive force acting on the dry medicament located in said dry compartment is provided by said at least one dynamic spring compression assembly; and
a needle assembly for dispensing the liquid injection solution containing the medicament dissolved therein.
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Accused Products
Abstract
The present invention is directed to an automatic injection device containing a pre-loaded charge of medicament for automatically self-administering the medicament upon actuation thereof. The automatic injection device includes a dry compartment located within a housing for storing a predetermined dry charge of the medicament therein, a wet compartment within the housing for storing a predetermined amount of liquid injection solution therein, an activation assembly for causing the liquid injection solution in the wet compartment to be transferred to the dry wet compartment, and at least one compression assembly for maintaining the medicament located in the dry compartment under a continuous compressive state as the liquid injection solution passes through the dry compartment.
143 Citations
8 Claims
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1. An automatic injection device containing a pre-loaded charge of medicament for automatically self-administering the medicament upon actuation thereof, said automatic injection device comprising:
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a housing assembly;
a dry compartment for storing a predetermined dry charge of dry medicament therein;
a wet compartment for storing a predetermined amount of liquid injection solution therein;
a pre-loaded activation assembly for causing the liquid injection solution in said wet compartment to be transferred to said dry compartment, wherein the pre-loaded activation assembly automatically supplies a driving force upon activation to transfer the liquid injection solution in the wet compartment to the dry compartment, wherein the dry medicament dissolves in the liquid injection solution as the liquid injection solution passes through said dry compartment;
at least one dynamic spring compression assembly for maintaining the dry medicament located in said dry compartment under a continuous compressive state as the liquid injection solution passes through said dry compartment, wherein at least a portion of a compressive force acting on the dry medicament located in said dry compartment is provided by said at least one dynamic spring compression assembly; and
a needle assembly for dispensing the liquid injection solution containing the medicament dissolved therein. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for administering an injection of medicament injection solution to a patient using an automatic injection device, said method comprising:
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locating an injection end of the automatic injection device adjacent a desired injection site on the patient;
activating a pre-loaded drive to automatically advance a collet into a wet compartment of the automatic injection device to pressurize the liquid injection solution in the liquid compartment and to cause an injection needle of the automatic injection device to advance and protrude through the injection end of the automatic injection device;
wherein the pressurization of the liquid injection solution causes the liquid injection solution to pass into a dry compartment adjacent the wet compartment where the liquid injection solution mixes with a compressed dry medicament to form a medicament injection solution which is then transmitted through the injection needle to the injection site where it is administered to the patient; and
maintaining the compressed dry medicament under a continuous compressive state using at least one dynamic spring compression assembly located within the automatic injection device.
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Specification